Zombies recover faster from crit. They heal Piercing damage (#16325)

Content.Shared/Zombies/ZombieComponent.cs

@@ -26,6 +26,25 @@ namespace Content.Shared.Zombies
         [ViewVariables(VVAccess.ReadWrite)]
         public float MaxZombieInfectionChance = 0.40f;
 
+        /// <summary>
+        /// Chance that this zombie be permanently killed (rolled once on crit->death transition)
+        /// </summary>
+        [ViewVariables(VVAccess.ReadWrite)]
+        public float ZombiePermadeathChance = 0.70f;
+
+        /// <summary>
+        /// Chance that this zombie will be healed (rolled each second when in crit or dead)
+        ///   3% means you have a 60% chance after 30 secs and a 84% chance after 60.
+        /// </summary>
+        [ViewVariables(VVAccess.ReadWrite)]
+        public float ZombieReviveChance = 0.03f;
+
+        /// <summary>
+        /// Has this zombie stopped healing now that it's died for real?
+        /// </summary>
+        [ViewVariables(VVAccess.ReadWrite)]
+        public bool Permadeath = false;
+
         /// <summary>
         /// The minimum infection chance possible. This is simply to prevent
         /// being invincible by bundling up.
@@ -97,8 +116,9 @@ namespace Content.Shared.Zombies
         {
             DamageDict = new ()
             {
-                { "Blunt", -0.3 },
+                { "Blunt", -0.4 },
                 { "Slash", -0.2 },
+                { "Piercing", -0.2 },
                 { "Heat", -0.2 },
                 { "Cold", -0.2 },
                 { "Shock", -0.2 },